Compress a Video to Send by Email

You recorded something on your phone, tried to email it, and the attachment was rejected. A two-minute 4K clip from a modern phone is routinely 300 to 500MB — more than ten times what any mainstream email service will carry.

There are two legitimate answers, and picking the right one first saves you re-encoding a file that was never going to fit.

Know the limits before you start

These are approximate and change. Two things make them stricter in practice:

• Encoding overhead. Attachments are converted to text for transmission, which inflates them by roughly a third. A 20MB file can be about 27MB by the time it crosses the wire. Aim for around three quarters of the stated limit.
• The recipient’s limit, not yours. The message has to be accepted by both servers. Corporate mail systems are frequently capped at 10MB. The smaller limit always wins.

A practical target is under 15MB for anything going to an address you do not control.

Decide first — compress, or send a link?

The reason longer videos fail is simple arithmetic. Fitting ten minutes into 15MB means about 200 kilobits per second for the whole file. That is below what any codec needs for watchable motion. Compression does not fail — the video does.

If you are in the bottom row, skip to the cloud link section. It is the correct answer, not a fallback.

Compress on a PC

The easy route — Windows Photos

1. Right-click the video and choose Open with → Photos.
2. Click Edit or the pencil icon, then Trim if the clip has dead space at either end.
3. Use Save as copy or the export option and choose a lower quality or resolution.

Trimming first is underrated. Cutting the first eight seconds of fumbling with the camera can remove a quarter of the file before you touch quality at all.

The better route — HandBrake

HandBrake is free, open source and available for Windows, Mac and Linux. It gives real control over the result.

1. Open HandBrake and load the video.
2. Under Presets, choose Fast 720p30. This alone usually cuts a phone video to a fraction of its original size.
3. On the Video tab, set the quality slider (RF) to around 24. Higher numbers mean smaller files. 20 is high quality, 28 is visibly soft.
4. Click Start Encode and watch the output size.

If the result is still too large, raise the RF value by two and re-encode, or step down to Fast 480p30 for footage that is mostly talking rather than motion.

What actually controls the size

Resolution does the heavy lifting. Start there.

Compress on a phone

iPhone

• Lower the capture setting first for future videos — Settings → Camera → Record Video, then choose 1080p at 30fps. 4K at 60fps is roughly four times the size for footage most people only ever watch on a phone.
• Trim in Photos. Open the video, tap Edit, drag the yellow handles, and save as a new clip.
• Use Mail’s own prompt. Attach the video in the Mail app and iOS offers Small, Medium, Large or Actual Size. Medium is usually under the limit and perfectly watchable.

Android

• Lower the capture resolution in the camera app’s settings for future clips.
• Trim in Google Photos. Open the video, tap Edit, trim, and Save copy.
• Google Photos sharing generates a link rather than attaching the file, which sidesteps the problem entirely.

Send a link instead

For anything over a few minutes, this is the right answer rather than a compromise. The recipient gets full quality and nothing bounces.

Gmail does this automatically. Attach a file larger than its limit and Gmail uploads it to Google Drive and inserts a link. One thing to check before sending: Gmail prompts about sharing permissions, and if you dismiss it the recipient has to request access. Set it to anyone with the link.

Outlook and OneDrive behave similarly — large attachments are offered as OneDrive links, with a choice of view-only or edit permissions.

Dedicated transfer services like WeTransfer send files up to several gigabytes without an account, with links that expire after a week or so. Useful for one-off sends to someone outside your organisation.

A note on sensitive content: links persist after the email is deleted. If the video is confidential, set an expiry date and restrict access to specific people rather than anyone with the link.

What not to do

• Do not zip the video. Video is already compressed. You will save one or two percent and add a step the recipient has to undo.
• Do not split the file into parts. Multi-part archives confuse most recipients and many mail filters block them outright.
• Do not re-compress an already compressed file repeatedly. Each pass is lossy and the quality degrades permanently. Always re-encode from the original.
• Do not use “free online video compressor” sites for anything private. You are uploading the file to a stranger’s server. For personal or work content, compress locally.
• Do not assume your limit is theirs. Corporate mail servers are often capped far lower than consumer services.
• Do not send a 4K video to someone who will watch it on a phone. You are sending four times the data for no visible benefit.

Related size problems

Video is not the only thing that bounces. If it is a PDF causing trouble, our compress a PDF under 1MB guide covers that case, and the PDF compressor handles it in your browser. For large photo attachments, the image compressor does the same for JPEG and PNG files.

And if the reason you are emailing the video at all is that the phone will not connect to your PC, fixing that is usually faster — see Android phone not showing up over USB or iPhone photos not showing on your PC.